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treewide: rename tree to maybe_tree 

Using the commit-graph file to walk commit history removes the large
cost of parsing commits during the walk. This exposes a performance
issue: lookup_tree() takes a large portion of the computation time,
even when Git never uses those trees.

In anticipation of lazy-loading these trees, rename the 'tree' member
of struct commit to 'maybe_tree'. This serves two purposes: it hints
at the future role of possibly being NULL even if the commit has a
valid tree, and it allows for unambiguous transformation from simple
member access (i.e. commit->maybe_tree) to method access.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2018-04-06 19:09:32 +00:00 коммит произвёл Junio C Hamano
Родитель 2d5792f071
Коммит 891435d55d
24 изменённых файлов: 65 добавлений и 64 удалений
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18
blame.c
Просмотреть файл

@ -553,10 +553,10 @@ static struct blame_origin *find_origin(struct commit *parent,
diff_setup_done(&diff_opts);
if (is_null_oid(&origin->commit->object.oid))
do_diff_cache(&parent->tree->object.oid, &diff_opts);
do_diff_cache(&parent->maybe_tree->object.oid, &diff_opts);
else
diff_tree_oid(&parent->tree->object.oid,
&origin->commit->tree->object.oid,
diff_tree_oid(&parent->maybe_tree->object.oid,
&origin->commit->maybe_tree->object.oid,
"", &diff_opts);
diffcore_std(&diff_opts);
@ -622,10 +622,10 @@ static struct blame_origin *find_rename(struct commit *parent,
diff_setup_done(&diff_opts);
if (is_null_oid(&origin->commit->object.oid))
do_diff_cache(&parent->tree->object.oid, &diff_opts);
do_diff_cache(&parent->maybe_tree->object.oid, &diff_opts);
else
diff_tree_oid(&parent->tree->object.oid,
&origin->commit->tree->object.oid,
diff_tree_oid(&parent->maybe_tree->object.oid,
&origin->commit->maybe_tree->object.oid,
"", &diff_opts);
diffcore_std(&diff_opts);
@ -1257,10 +1257,10 @@ static void find_copy_in_parent(struct blame_scoreboard *sb,
diff_opts.flags.find_copies_harder = 1;
if (is_null_oid(&target->commit->object.oid))
do_diff_cache(&parent->tree->object.oid, &diff_opts);
do_diff_cache(&parent->maybe_tree->object.oid, &diff_opts);
else
diff_tree_oid(&parent->tree->object.oid,
&target->commit->tree->object.oid,
diff_tree_oid(&parent->maybe_tree->object.oid,
&target->commit->maybe_tree->object.oid,
"", &diff_opts);
if (!diff_opts.flags.find_copies_harder)

12
builtin/checkout.c
Просмотреть файл

@ -484,7 +484,7 @@ static int merge_working_tree(const struct checkout_opts *opts,
resolve_undo_clear();
if (opts->force) {
ret = reset_tree(new_branch_info->commit->tree, opts, 1, writeout_error);
ret = reset_tree(new_branch_info->commit->maybe_tree, opts, 1, writeout_error);
if (ret)
return ret;
} else {
@ -570,18 +570,18 @@ static int merge_working_tree(const struct checkout_opts *opts,
o.verbosity = 0;
work = write_tree_from_memory(&o);
ret = reset_tree(new_branch_info->commit->tree, opts, 1,
ret = reset_tree(new_branch_info->commit->maybe_tree, opts, 1,
writeout_error);
if (ret)
return ret;
o.ancestor = old_branch_info->name;
o.branch1 = new_branch_info->name;
o.branch2 = "local";
ret = merge_trees(&o, new_branch_info->commit->tree, work,
old_branch_info->commit->tree, &result);
ret = merge_trees(&o, new_branch_info->commit->maybe_tree, work,
old_branch_info->commit->maybe_tree, &result);
if (ret < 0)
exit(128);
ret = reset_tree(new_branch_info->commit->tree, opts, 0,
ret = reset_tree(new_branch_info->commit->maybe_tree, opts, 0,
writeout_error);
strbuf_release(&o.obuf);
if (ret)
@ -1002,7 +1002,7 @@ static int parse_branchname_arg(int argc, const char **argv,
*source_tree = parse_tree_indirect(rev);
} else {
parse_commit_or_die(new_branch_info->commit);
*source_tree = new_branch_info->commit->tree;
*source_tree = new_branch_info->commit->maybe_tree;
}
if (!*source_tree) /* case (1): want a tree */

2
builtin/diff.c
Просмотреть файл

@ -398,7 +398,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
if (!obj)
die(_("invalid object '%s' given."), name);
if (obj->type == OBJ_COMMIT)
obj = &((struct commit *)obj)->tree->object;
obj = &((struct commit *)obj)->maybe_tree->object;
if (obj->type == OBJ_TREE) {
obj->flags |= flags;

6
builtin/fast-export.c
Просмотреть файл

@ -578,11 +578,11 @@ static void handle_commit(struct commit *commit, struct rev_info *rev,
get_object_mark(&commit->parents->item->object) != 0 &&
!full_tree) {
parse_commit_or_die(commit->parents->item);
diff_tree_oid(&commit->parents->item->tree->object.oid,
&commit->tree->object.oid, "", &rev->diffopt);
diff_tree_oid(&commit->parents->item->maybe_tree->object.oid,
&commit->maybe_tree->object.oid, "", &rev->diffopt);
}
else
diff_root_tree_oid(&commit->tree->object.oid,
diff_root_tree_oid(&commit->maybe_tree->object.oid,
"", &rev->diffopt);
/* Export the referenced blobs, and remember the marks. */

4
builtin/log.c
Просмотреть файл

@ -1064,8 +1064,8 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
diff_setup_done(&opts);
diff_tree_oid(&origin->tree->object.oid,
&head->tree->object.oid,
diff_tree_oid(&origin->maybe_tree->object.oid,
&head->maybe_tree->object.oid,
"", &opts);
diffcore_std(&opts);
diff_flush(&opts);

2
builtin/reflog.c
Просмотреть файл

@ -153,7 +153,7 @@ static int commit_is_complete(struct commit *commit)
for (i = 0; i < found.nr; i++) {
struct commit *c =
(struct commit *)found.objects[i].item;
if (!tree_is_complete(&c->tree->object.oid)) {
if (!tree_is_complete(&c->maybe_tree->object.oid)) {
is_incomplete = 1;
c->object.flags |= INCOMPLETE;
}

4
commit-graph.c
Просмотреть файл

@ -258,7 +258,7 @@ static int fill_commit_in_graph(struct commit *item, struct commit_graph *g, uin
item->graph_pos = pos;
hashcpy(oid.hash, commit_data);
item->tree = lookup_tree(&oid);
item->maybe_tree = lookup_tree(&oid);
date_high = get_be32(commit_data + g->hash_len + 8) & 0x3;
date_low = get_be32(commit_data + g->hash_len + 12);
@ -369,7 +369,7 @@ static void write_graph_chunk_data(struct hashfile *f, int hash_len,
uint32_t packedDate[2];
parse_commit(*list);
hashwrite(f, (*list)->tree->object.oid.hash, hash_len);
hashwrite(f, (*list)->maybe_tree->object.oid.hash, hash_len);
parent = (*list)->parents;

2
commit.c
Просмотреть файл

@ -335,7 +335,7 @@ int parse_commit_buffer(struct commit *item, const void *buffer, unsigned long s
if (get_sha1_hex(bufptr + 5, parent.hash) < 0)
return error("bad tree pointer in commit %s",
oid_to_hex(&item->object.oid));
item->tree = lookup_tree(&parent);
item->maybe_tree = lookup_tree(&parent);
bufptr += tree_entry_len + 1; /* "tree " + "hex sha1" + "\n" */
pptr = &item->parents;

2
commit.h
Просмотреть файл

@ -22,7 +22,7 @@ struct commit {
unsigned int index;
timestamp_t date;
struct commit_list *parents;
struct tree *tree;
struct tree *maybe_tree;
uint32_t graph_pos;
};

6
fsck.c
Просмотреть файл

@ -396,9 +396,9 @@ static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_optio
name = get_object_name(options, &commit->object);
if (name)
put_object_name(options, &commit->tree->object, "%s:", name);
put_object_name(options, &commit->maybe_tree->object, "%s:", name);
result = options->walk((struct object *)commit->tree, OBJ_TREE, data, options);
result = options->walk((struct object *)commit->maybe_tree, OBJ_TREE, data, options);
if (result < 0)
return result;
res = result;
@ -772,7 +772,7 @@ static int fsck_commit_buffer(struct commit *commit, const char *buffer,
err = fsck_ident(&buffer, &commit->object, options);
if (err)
return err;
if (!commit->tree) {
if (!commit->maybe_tree) {
err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
if (err)
return err;

2
http-push.c
Просмотреть файл

@ -1330,7 +1330,7 @@ static int get_delta(struct rev_info *revs, struct remote_lock *lock)
int count = 0;
while ((commit = get_revision(revs)) != NULL) {
p = process_tree(commit->tree, p);
p = process_tree(commit->maybe_tree, p);
commit->object.flags |= LOCAL;
if (!(commit->object.flags & UNINTERESTING))
count += add_send_request(&commit->object, lock);

4
line-log.c
Просмотреть файл

@ -817,8 +817,8 @@ static void queue_diffs(struct line_log_data *range,
assert(commit);
DIFF_QUEUE_CLEAR(&diff_queued_diff);
diff_tree_oid(parent ? &parent->tree->object.oid : NULL,
&commit->tree->object.oid, "", opt);
diff_tree_oid(parent ? &parent->maybe_tree->object.oid : NULL,
&commit->maybe_tree->object.oid, "", opt);
if (opt->detect_rename) {
filter_diffs_for_paths(range, 1);
if (diff_might_be_rename())

10
list-objects.c
Просмотреть файл

@ -195,7 +195,7 @@ static void mark_edge_parents_uninteresting(struct commit *commit,
struct commit *parent = parents->item;
if (!(parent->object.flags & UNINTERESTING))
continue;
mark_tree_uninteresting(parent->tree);
mark_tree_uninteresting(parent->maybe_tree);
if (revs->edge_hint && !(parent->object.flags & SHOWN)) {
parent->object.flags |= SHOWN;
show_edge(parent);
@ -212,7 +212,7 @@ void mark_edges_uninteresting(struct rev_info *revs, show_edge_fn show_edge)
struct commit *commit = list->item;
if (commit->object.flags & UNINTERESTING) {
mark_tree_uninteresting(commit->tree);
mark_tree_uninteresting(commit->maybe_tree);
if (revs->edge_hint_aggressive && !(commit->object.flags & SHOWN)) {
commit->object.flags |= SHOWN;
show_edge(commit);
@ -227,7 +227,7 @@ void mark_edges_uninteresting(struct rev_info *revs, show_edge_fn show_edge)
struct commit *commit = (struct commit *)obj;
if (obj->type != OBJ_COMMIT || !(obj->flags & UNINTERESTING))
continue;
mark_tree_uninteresting(commit->tree);
mark_tree_uninteresting(commit->maybe_tree);
if (!(obj->flags & SHOWN)) {
obj->flags |= SHOWN;
show_edge(commit);
@ -300,8 +300,8 @@ static void do_traverse(struct rev_info *revs,
* an uninteresting boundary commit may not have its tree
* parsed yet, but we are not going to show them anyway
*/
if (commit->tree)
add_pending_tree(revs, commit->tree);
if (commit->maybe_tree)
add_pending_tree(revs, commit->maybe_tree);
show_commit(commit, show_data);
if (revs->tree_blobs_in_commit_order)

6
log-tree.c
Просмотреть файл

@ -806,7 +806,7 @@ static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log
return 0;
parse_commit_or_die(commit);
oid = &commit->tree->object.oid;
oid = &commit->maybe_tree->object.oid;
/* Root commit? */
parents = get_saved_parents(opt, commit);
@ -831,7 +831,7 @@ static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log
* we merged _in_.
*/
parse_commit_or_die(parents->item);
diff_tree_oid(&parents->item->tree->object.oid,
diff_tree_oid(&parents->item->maybe_tree->object.oid,
oid, "", &opt->diffopt);
log_tree_diff_flush(opt);
return !opt->loginfo;
@ -846,7 +846,7 @@ static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log
struct commit *parent = parents->item;
parse_commit_or_die(parent);
diff_tree_oid(&parent->tree->object.oid,
diff_tree_oid(&parent->maybe_tree->object.oid,
oid, "", &opt->diffopt);
log_tree_diff_flush(opt);

5
merge-recursive.c
Просмотреть файл

@ -101,7 +101,7 @@ static struct commit *make_virtual_commit(struct tree *tree, const char *comment
struct commit *commit = alloc_commit_node();
set_merge_remote_desc(commit, comment, (struct object *)commit);
commit->tree = tree;
commit->maybe_tree = tree;
commit->object.parsed = 1;
return commit;
}
@ -2154,7 +2154,8 @@ int merge_recursive(struct merge_options *o,
read_cache();
o->ancestor = "merged common ancestors";
clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
clean = merge_trees(o, h1->maybe_tree, h2->maybe_tree,
merged_common_ancestors->maybe_tree,
&mrtree);
if (clean < 0) {
flush_output(o);

8
notes-merge.c
Просмотреть файл

@ -600,14 +600,14 @@ int notes_merge(struct notes_merge_options *o,
printf("No merge base found; doing history-less merge\n");
} else if (!bases->next) {
base_oid = &bases->item->object.oid;
base_tree_oid = &bases->item->tree->object.oid;
base_tree_oid = &bases->item->maybe_tree->object.oid;
if (o->verbosity >= 4)
printf("One merge base found (%.7s)\n",
oid_to_hex(base_oid));
} else {
/* TODO: How to handle multiple merge-bases? */
base_oid = &bases->item->object.oid;
base_tree_oid = &bases->item->tree->object.oid;
base_tree_oid = &bases->item->maybe_tree->object.oid;
if (o->verbosity >= 3)
printf("Multiple merge bases found. Using the first "
"(%.7s)\n", oid_to_hex(base_oid));
@ -634,8 +634,8 @@ int notes_merge(struct notes_merge_options *o,
goto found_result;
}
result = merge_from_diffs(o, base_tree_oid, &local->tree->object.oid,
&remote->tree->object.oid, local_tree);
result = merge_from_diffs(o, base_tree_oid, &local->maybe_tree->object.oid,
&remote->maybe_tree->object.oid, local_tree);
if (result != 0) { /* non-trivial merge (with or without conflicts) */
/* Commit (partial) result */

2
packfile.c
Просмотреть файл

@ -1925,7 +1925,7 @@ static int add_promisor_object(const struct object_id *oid,
struct commit *commit = (struct commit *) obj;
struct commit_list *parents = commit->parents;
oidset_insert(set, &commit->tree->object.oid);
oidset_insert(set, &commit->maybe_tree->object.oid);
for (; parents; parents = parents->next)
oidset_insert(set, &parents->item->object.oid);
} else if (obj->type == OBJ_TAG) {

4
pretty.c
Просмотреть файл

@ -1161,10 +1161,10 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
return 1;
case 'T': /* tree hash */
strbuf_addstr(sb, oid_to_hex(&commit->tree->object.oid));
strbuf_addstr(sb, oid_to_hex(&commit->maybe_tree->object.oid));
return 1;
case 't': /* abbreviated tree hash */
strbuf_add_unique_abbrev(sb, commit->tree->object.oid.hash,
strbuf_add_unique_abbrev(sb, commit->maybe_tree->object.oid.hash,
c->pretty_ctx->abbrev);
return 1;
case 'P': /* parent hashes */

2
ref-filter.c
Просмотреть файл

@ -815,7 +815,7 @@ static void grab_commit_values(struct atom_value *val, int deref, struct object
if (deref)
name++;
if (!strcmp(name, "tree")) {
v->s = xstrdup(oid_to_hex(&commit->tree->object.oid));
v->s = xstrdup(oid_to_hex(&commit->maybe_tree->object.oid));
}
else if (!strcmp(name, "numparent")) {
v->value = commit_list_count(commit->parents);

8
revision.c
Просмотреть файл

@ -439,8 +439,8 @@ static void file_change(struct diff_options *options,
static int rev_compare_tree(struct rev_info *revs,
struct commit *parent, struct commit *commit)
{
struct tree *t1 = parent->tree;
struct tree *t2 = commit->tree;
struct tree *t1 = parent->maybe_tree;
struct tree *t2 = commit->maybe_tree;
if (!t1)
return REV_TREE_NEW;
@ -476,7 +476,7 @@ static int rev_compare_tree(struct rev_info *revs,
static int rev_same_tree_as_empty(struct rev_info *revs, struct commit *commit)
{
int retval;
struct tree *t1 = commit->tree;
struct tree *t1 = commit->maybe_tree;
if (!t1)
return 0;
@ -614,7 +614,7 @@ static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
if (!revs->prune)
return;
if (!commit->tree)
if (!commit->maybe_tree)
return;
if (!commit->parents) {

12
sequencer.c
Просмотреть файл

@ -501,8 +501,8 @@ static int do_recursive_merge(struct commit *base, struct commit *next,
o.show_rename_progress = 1;
head_tree = parse_tree_indirect(head);
next_tree = next ? next->tree : empty_tree();
base_tree = base ? base->tree : empty_tree();
next_tree = next ? next->maybe_tree : empty_tree();
base_tree = base ? base->maybe_tree : empty_tree();
for (xopt = opts->xopts; xopt != opts->xopts + opts->xopts_nr; xopt++)
parse_merge_opt(&o, *xopt);
@ -562,7 +562,7 @@ static int is_index_unchanged(void)
return error(_("unable to update cache tree"));
return !oidcmp(&active_cache_tree->oid,
&head_commit->tree->object.oid);
&head_commit->maybe_tree->object.oid);
}
static int write_author_script(const char *message)
@ -1119,7 +1119,7 @@ static int try_to_commit(struct strbuf *msg, const char *author,
}
if (!(flags & ALLOW_EMPTY) && !oidcmp(current_head ?
&current_head->tree->object.oid :
&current_head->maybe_tree->object.oid :
&empty_tree_oid, &tree)) {
res = 1; /* run 'git commit' to display error message */
goto out;
@ -1217,12 +1217,12 @@ static int is_original_commit_empty(struct commit *commit)
if (parse_commit(parent))
return error(_("could not parse parent commit %s"),
oid_to_hex(&parent->object.oid));
ptree_oid = &parent->tree->object.oid;
ptree_oid = &parent->maybe_tree->object.oid;
} else {
ptree_oid = the_hash_algo->empty_tree; /* commit is root */
}
return !oidcmp(ptree_oid, &commit->tree->object.oid);
return !oidcmp(ptree_oid, &commit->maybe_tree->object.oid);
}
/*

2
sha1_name.c
Просмотреть файл

@ -896,7 +896,7 @@ struct object *peel_to_type(const char *name, int namelen,
if (o->type == OBJ_TAG)
o = ((struct tag*) o)->tagged;
else if (o->type == OBJ_COMMIT)
o = &(((struct commit *) o)->tree->object);
o = &(((struct commit *) o)->maybe_tree->object);
else {
if (name)
error("%.*s: expected %s type, but the object "

4
tree.c
Просмотреть файл

@ -109,7 +109,7 @@ static int read_tree_1(struct tree *tree, struct strbuf *base,
oid_to_hex(entry.oid),
base->buf, entry.path);
oidcpy(&oid, &commit->tree->object.oid);
oidcpy(&oid, &commit->maybe_tree->object.oid);
}
else
continue;
@ -248,7 +248,7 @@ struct tree *parse_tree_indirect(const struct object_id *oid)
if (obj->type == OBJ_TREE)
return (struct tree *) obj;
else if (obj->type == OBJ_COMMIT)
obj = &(((struct commit *) obj)->tree->object);
obj = &(((struct commit *) obj)->maybe_tree->object);
else if (obj->type == OBJ_TAG)
obj = ((struct tag *) obj)->tagged;
else

2
walker.c
Просмотреть файл

@ -87,7 +87,7 @@ static int process_commit(struct walker *walker, struct commit *commit)
walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
if (walker->get_tree) {
if (process(walker, &commit->tree->object))
if (process(walker, &commit->maybe_tree->object))
return -1;
if (!walker->get_all)
walker->get_tree = 0;